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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af7791e0360cfaec85931e8a1958c4a6c8d1675288fc177ed39e40fcda8d2e97' 
  AND token = 'WRHWQcuE1sEz/7f2kbT7agLERwS/3fXcePiaGAl+fdM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}